S-90452A121 Washers for Square-Neck Bolts

Key Features & Benefits at a Glance

• Corrosion-resistant 18-8 stainless steel construction ensures long-lasting performance in humid or chemical environments, reducing replacement frequency.
• Precision square hole design with 0.392" inside width provides secure anti-rotation locking for 3/8" screws, preventing loosening under vibration.
• Generous 0.9" outer diameter distributes load effectively, protecting surfaces and increasing joint integrity in heavy-duty applications.
• Consistent 0.085-0.095" thickness maintains uniform pressure distribution, ensuring reliable sealing and fastener performance.
• RoHS 3 and REACH compliance guarantees environmental safety and material traceability, meeting strict international regulatory standards.
• Inch system compatibility simplifies sourcing and integration with North American machinery and existing fastener inventories.
• Durable stainless steel material offers excellent strength-to-weight ratio for demanding industrial, automotive, and construction applications.

Professional Applications & Engineering Value

This square hole washer addresses critical engineering challenges in heavy-duty industrial applications where vibration resistance and material durability are paramount. The 18-8 stainless steel composition provides superior corrosion resistance compared to carbon steel alternatives, making it ideal for outdoor equipment, marine hardware, and chemical processing installations. The precision square hole design creates a positive locking mechanism that prevents screw rotation – a common failure point in vibrating machinery. With its 0.9" OD and optimized thickness range, this washer effectively distributes clamping force across a wider surface area, preventing material deformation in soft substrates like aluminum or composite materials. The RoHS 3 and REACH compliance ensures these components meet the strictest environmental regulations for international projects and sensitive applications.

Specification Summary & Compliance

This square hole washer features precise dimensional specifications including 0.9" outer diameter, 0.392" inside width, and thickness range of 0.085-0.095". Manufactured from 18-8 stainless steel for consistent mechanical properties, it's engineered for use with 3/8" screws in inch system applications. The product maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency. While hardness is not specifically rated, the stainless steel construction provides reliable performance across typical industrial temperature and load conditions.